package com.wuji1626.spark.rdd.transform

import org.apache.spark.{SparkConf, SparkContext}

object RDD_Transform_mapPartitions {

  def main(args: Array[String]): Unit = {
    // Step1: 准备环境
    val sparkConf = new SparkConf().setMaster("local[*]").setAppName("Operator")
    val sc = new SparkContext(sparkConf)

    // Step2: 算子 mapPartitions
    val rdd = sc.makeRDD(List(1, 2, 3, 4),numSlices = 2)

    val mp = rdd.mapPartitions(
      iter => {
        println(">>>>>>")
        iter.map(_ * 2)
      }
    )
    mp.collect().foreach(println)
    // Step3: 关闭环境
    sc.stop()
  }

}
